Improvement in coffee and spice mills



0. W. PIERCE. COFFEE AND SPICE MILL.

Patented Jan. 6, 1863.

UNITED STATES PATENT OFFICE.

CHARLES w. PIERCE, OF'OAK ILMQNE YORK.

lMPROVEMENT lN COFFEE AND SPJICEV MILLS? Specification forming part Letters Patent No.,3 7.35S, datedJanuary 6, i863;

To all whom it may concern:

Be it known that I, CHARLES W. PIERCE, of Oak Hill, in the county of Greene and State of New York, have invented a new and useful Improvement in Mills for Grinding Coffee, Spices, and like substances; and I do hereby declare that the following is a full, clear, and

purposesor grinding cofl'ee, spices, 86G.

' The invention consists in having the rotary grinder provided with two grindihgsurfacmone at each side-one grinding-surface having finer cutting-edges than the other, and

using in connection with the grinder thus con-.

structed an adjustable plate or valve, arranged in such a manner that it may be so adjusted to admit of either side or the grinder being used, as desired, or both used simultaneously.

The object of the invention is to obtain a mill of the kind specified, which will admit of either coffee or spice being properly ground in it, or any one article being ground with different degrees of fineness, as may be required, and thereby render the use or purchase of two diflerent mills unnecessary, by combining in a simple and economical manner two different mills in one.

To enable those skilled in the art to fully understand and construct my invention, I will proceed to describe it.

A represents. the grinder of the mill, which is composed of two convex sides, a a, each of which is provided with cutting-edges b, similar to the grinders of the ordinary mills of the kind ii -present use. The cutting-edges of the side or, however, are finer or nearer together than those of a, in order that it may be suitable for grinding substances finer than a, the side a being made like the grinder of a spice-mill, while the side a/ is made like the grinder of a coffee-mill. This grinder is placed on a shaft, B, the bearings of which are in a case, G, the inner surfaces of the latter being concave, so as to correspond inversely, or nearly so, with the sides a a of the grinder.

The grinder is made of two distinct parts, one of which, a, may be permanently attached to shaft B',the latter passing loosely through the other partyayand fitting in a collar, b, through which and into the end of shaft Ba screw, 0, passes. the parts a a may be adjusted nearer to or farther from the sides of the case (J, in order toregulate in a measure the degree-of fineness of the substances to be ground. The-two parts a a have ears or lugs d attheirinner sides, by which a is made to turn a. The inner sides of the case 0 are corrugated or provided with cutting-edges to form grinding-surfaces. The lower end of the case (J is provided with a discharge-spout, D, and the upper part has a hopper, E, connected with it. In the lower part'of the hopper there is placed a cross-bar, F, which is directly over the center of the grinder, and G is a plate or valve, which is placed directly over the cross-bar F, the lower edge of the plate or valve fitting in a groove, b", in the upper surface of the crossbar. The plate or valve, at its lower part, is provided at each side with a journal, 6", the bearings of which are in the sides of the hopper lo. One of these bearings extends through the side of the hopper and has a thumb-piece, 01, attached to it, as shown in Fig. 3. 1 The plate or valve G isof such dimensions that when turned either to the right or left it will serve as a cut-elf, and prevent the substance in the hopper from passing down to the side of the grinder, over which it is adjusted, and by turningthe plate or valve in a vertical position the substance in the hopper-will pass down at both sides of the grinder. In Fig. 1

the plate or valve is shown in a vertical position in blue tint, and shown adjusted to either side of the hopper in red outline. The shaft B of the grinder is turned by means of a crank, H. The journals 0* 0 of the plate or valve G are fitted sufficientlytight in the sides of the hopper E to retain or hold the plate or.

By turning this screw 0 cording to which side of the grinder is used, or when a certain degree of fineness is not necessary both sides of the grinder may be used simultaneously. I would remark that the case 0 is provided with a projecting plate, a", through which screws or bolts pass to secure the mill to any suitable fixture. I

Having thus described my invention, what Iclaim asnew, and desire to secure by Letters Patent, is-- The adjustable plate or valve G, placed in the hopper E, in combination with the double rotary grinder A placed within the case 0, substantially as and for the purpose herein set forth.

CHARLES W; PIERCE. 

